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https://issues.apache.org/jira/browse/HADOOP-16633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16944803#comment-16944803
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Steve Loughran commented on HADOOP-16633:
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need to add .surefire-* as a .gitignore pattern or your dir fills with noise

surefire-294760398D3959E2513AEBE592B10FF704BE4546
        .surefire-453A152B0DF35F464F936BCAF7F407CA7671BA43
        .surefire-8E57C79C17893C5B3E00303D6B725D5697467205
        .surefire-9665BD9E6464CE0800434B669411DE367370118B
        .surefire-DF7F2A2482F864AE5F5D482F70ED6DFD18C51669

> Tune hadoop-aws parallel test surefire/failsafe settings
> --------------------------------------------------------
>
>                 Key: HADOOP-16633
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16633
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: build, fs/s3, test
>    Affects Versions: 3.2.1
>            Reporter: Steve Loughran
>            Priority: Major
>
> We can do more to improve our test runs by looking at the failsafe docs
> [http://maven.apache.org/surefire/maven-failsafe-plugin/integration-test-mojo.html]
>  
> * default value to be by core, eg. 2C
> * use the runorder attribute which determines how parallel runs are chosen; 
> random for better nondeterminism
>  We'd need to experiment first, which can be done by setting failsafe.runOrder



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